The thermal effect on magnetic properties of iron-containing coatings formed on titanium by plasma-electrolytic oxidation

The effect of annealing in air at T an temperature up to 800°C on the magnetic characteristics, elemental and phase composition, and surface morphology of iron-containing oxide coatings on titanium is studied. Annealing at T an ≤ 500°C does not seem to affect the composition and morphology of coatin...

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Bibliographic Details
Published in:Protection of metals and physical chemistry of surfaces 2012-11, Vol.48 (6), p.671-677
Main Authors: Rudnev, V. S., Adigamova, M. V., Lukiyanchuk, I. V., Ustinov, A. Yu, Tkachenko, I. A., Kharitonskii, P. V., Frolov, A. M., Morozova, V. P.
Format: Article
Language:English
Subjects:
Annealing
Characterization and Evaluation of Materials
Chemistry and Materials Science
Coatings
Corrosion and Coatings
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Iron
Magnetic properties
Materials
Materials Science
Metallic Materials
Morphology
New Substances
Oxide coatings
Porosity
Titanium
Tribology
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Summary:The effect of annealing in air at T an temperature up to 800°C on the magnetic characteristics, elemental and phase composition, and surface morphology of iron-containing oxide coatings on titanium is studied. Annealing at T an ≤ 500°C does not seem to affect the composition and morphology of coatings. The coercive force ( H c ) of specimens equals 70 Oe at room temperature and 256 Oe at 2 K. Upon annealing at 700 or 800°C, the H c value decreases to 13 Oe. The change in the magnetic characteristics correlates with the crystallization of a number of iron and titanium phosphates, the redistribution of elements in the coatings and pores, and the surface formation of microcrystals and whiskers.
ISSN:2070-2051
2070-206X
DOI:10.1134/S2070205112060123